Pascal,
Some typos and suggestions below.
4.2.2. Scheduling Functions and the 6P Protocol (6P)
In the case of soft cells, the cell management entity that controls
the dynamic attribution of cells to adapt to the dynamics of variable
rate flows is called Scheduling Function (SF). There may be
multiple SFs, each implementing a different policy to adapt to varying
network traffic. The 6TiSCH 6top Scheduling Function Zero (SF0)
[I-D.ietf-6tisch-6top-sf0] provides a simple scheduling function that
can be used by default by devices that support dynamic scheduling of
soft cells.
The SF is logically divided in an abstract bandwidth adaptation policy
which is abstract to the particular technology used to obtain and
release bandwidth,
TW> I don't understand the previous sentence
and a underlying service sublayer which identifies the
appropriate TSCH cells to use.
+------------------------+ +------------------------+
| Scheduling Function | | Scheduling Function |
| Bandwidth adaptation | | Bandwidth adaptation |
+------------------------+ +------------------------+
| Scheduling Function | | Scheduling Function |
| TSCH cell mapping | | TSCH cell mapping |
+------------------------+ +------------------------+
| 6top cells negotiation | <- 6P -> | 6top cells negotiation |
+------------------------+ +------------------------+
Figure 6: SF/6P stack in 6top
The SF relies on the 6top Protocol (6P)
[I-D.ietf-6tisch-6top-protocol] to negotiate the cells between
neighbor nodes. It
may be for instance that a node wants to use a particular time slot
that is free in its schedule, but which is already in use by
its neighbor. The 6P protocol enables the neighbor nodes to find
an agreement on which cells to use.
On Friday, June 3, 2016, Pascal Thubert (pthubert) <[email protected]>
wrote:
> Dear all:
>
> As discussed at the last Interim, please find proposed text in the 6TiSCH
> architecture below.
>
> What do you think?
>
> Pascal
>
> 4.2.2. Scheduling Functions and the 6P protocol
>
> In the case of soft cells, the cell management entity that controls
> the dynamic attribution of cells to adapt to the dynamics of variable
> rate flows is called a Scheduling Function (SF). There may be
> multiple SFs with more or less aggressive reaction to the dynamics of
> the network. The 6TiSCH 6top Scheduling Function Zero (SF0)
> [I-D.ietf-6tisch-6top-sf0] provides a simple scheduling function that
> can be used by default by devices that support dynamic scheduling of
> soft cells.
>
> The SF is logically divided in an abstract bandwidth adaptation logic
> that is abstract to the particular technology used to obtain and
> release bandwidth, and a underlying service sublayer that maps those
> needs in the actual technology, which means identifying the
> appropriate cells in the context of TSCH.
>
> +------------------------+ +------------------------+
> | Scheduling Function | | Scheduling Function |
> | Bandwidth adaptation | | Bandwidth adaptation |
> +------------------------+ +------------------------+
> | Scheduling Function | | Scheduling Function |
> | TSCH mapping to cells | | TSCH mapping to cells |
> +------------------------+ +------------------------+
> | 6top cells negotiation | <- 6P -> | 6top cells negotiation |
> +------------------------+ +------------------------+
>
>
> Figure 6: SF/6P stack in 6top
>
> The SF relies on 6top services that implement the 6top Protocol (6P)
> [I-D.ietf-6tisch-6top-protocol] to negotiate the precise cells that
> will be allocated or freed based on the schedules of the peer. It
> may be for instance that a peer wants to use a particular time slot
> that is free in its schedule, but that timeslot is already in use by
> the other peer for a communication with a third party on a different
> cell. The 6P protocol enables the peers to find an agreement in a
> transactional manner that ensures the final consistency of the nodes
> state.
>
> _______________________________________________
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> https://www.ietf.org/mailman/listinfo/6tisch
>
--
_______________________________________
Thomas Watteyne, PhD
Research Scientist & Innovator, Inria
Sr Networking Design Eng, Linear Tech
Founder & co-lead, UC Berkeley OpenWSN
Co-chair, IETF 6TiSCH
www.thomaswatteyne.com
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